Member
Hello. Few days ago tested 1 bar boost pressure. Everything was fine. Yesterday I lowered boost and a problem appeared.. when boost is higher that 0.55 +- @ 3 - 4 k rpm something cuts out, feels like fuel or boost, after 4k it runs great up till redline. Could the spark gaps make such a problem? Why no problem when it was at 1 bar?
Ring Master
Turn it back to 1bar and see if the issue remains. Probably messed something else up. Correlation / causation scenario.
Not plugs, probably tuning issues if not mechanical error.
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Last edited by vollosso; 03-25-2017 at 08:04 AM.
1989 535i - sold
1999 M3 Tiag/Dove - sold
1998 M3 Turbo Arctic/black - current
2004 Built motor TiAg/Black - Sold
2008 E61 19T Turbo-Wagon - current
2011 E82 135i - S85 Swap - current
1998 M3 Cosmos S54 swapped Sedan - current
1998 Turbo: PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53
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Member
What are your AFRs when the issue is occuring? If it's really rich, might be causing your problem.
Member
Lamda is around 0.78 - 0.8, thats probably the best on e85 on full load.
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